<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      * {
        padding: 0;
        margin: 0;
      }

      html,
      body,
      .room {
        height: 100%;
        width: 100%;
      }

      .room {
        display: flex;
      }

      .left {
        width: 300px;
        border-right: 0.5px solid #f5f5f5;
        background: #333;
      }

      .right {
        background: #1c1c1c;
        flex: 1;
        display: flex;
        flex-direction: column;
      }

      .header {
        background: #8d0eb0;
        color: white;
        padding: 10px;
        box-sizing: border-box;
        font-size: 20px;
      }

      .main {
        flex: 1;
        padding: 10px;
        box-sizing: border-box;
        font-size: 20px;
        overflow: auto;
      }

      .main-chat {
        color: green;
      }

      .footer {
        min-height: 200px;
        border-top: 1px solid green;
      }

      .footer .ipt {
        width: 100%;
        height: 100%;
        color: green;
        outline: none;
        font-size: 20px;
        padding: 10px;
        box-sizing: border-box;
      }

      .groupList {
        height: 100%;
        overflow: auto;
      }

      .groupList-items {
        height: 50px;
        width: 100%;
        background: #131313;
        display: flex;
        align-items: center;
        justify-content: center;
        color: white;
      }
    </style>
  </head>
  <div class="room">
    <div class="left">
      <div class="groupList"></div>
    </div>
    <div class="right">
      <header class="header">聊天室</header>
      <main class="main"></main>
      <footer class="footer">
        <div class="ipt" contenteditable></div>
      </footer>
    </div>
  </div>

  <body>
    <script type="module">
      const sendMessage = message => {
        const div = document.createElement('div')
        div.className = 'main-chat'
        div.innerText = `${message.user}:${message.text}`
        main.appendChild(div)
      }
      const groupEl = document.querySelector('.groupList')
      const main = document.querySelector('.main')
      import { io } from 'https://cdn.socket.io/4.7.4/socket.io.esm.min.js'
      const name = prompt('请输入你的名字')
      const room = prompt('请输入房间号')
      const socket = io('ws://localhost:3000')
      //键盘按下发送消息
      document.addEventListener('keydown', e => {
        if (e.key === 'Enter') {
          e.preventDefault()
          const ipt = document.querySelector('.ipt')
          socket.emit('message', {
            text: ipt.innerText,
            room: room,
            user: name,
          })
          sendMessage({
            text: ipt.innerText,
            user: name,
          })
          ipt.innerText = ''
        }
      })
      //连接成功socket
      socket.on('connect', () => {
        socket.emit('join', { name, room }) //加入一个房间
        socket.on('message', message => {
          sendMessage(message)
        })
        socket.on('groupList', groupList => {
          console.log(groupList)
          groupEl.innerHTML = ''
          Object.keys(groupList).forEach(key => {
            const item = document.createElement('div')
            item.className = 'groupList-items'
            item.innerText = `房间名称:${key} 房间人数:${groupList[key].length}`
            groupEl.appendChild(item)
          })
        })
      })
    </script>
  </body>
</html>
